120 + 32 - 12 x 8 : 4
120 + 32 - (12 x 8) : 4
120 + 32 - (96 : 4)
= 120 + 32 - 24
= 152 - 24
= 128
Semoga bermanfaat...
A sample size of 60 is required.
We use the formula
We first find the z-score associated with this level of confidence:
Convert 99% to a decimal: 99/100 = 0.99
Subtract from 1: 1-0.99 = 0.01
Divide by 2: 0.01/2 = 0.005
Subtract from 1: 1-0.005 = 0.995
Using a z-table (http://www.z-table.com) we see that this value is equally distant from 2.57 and 2.58; therefore we will use 2.575: